Brake



Aug. 25, 1936. v M. w. MCCONKEY BRAKE 1 Filed Feb. 11, 1929 2 Sheets-Sheet 1 INVENTOR. 7

1936. M. w. MCCONKEY 2,051,879

BRAKE Filed Feb. 11, 1929 2 Sheets-Sheet 2 Patented Aug. 1936 BRAKE Montgomery W. 1 McConkey,

assignor to south Bend, ma,

Bendix Brake Company, South Bend, Ind., a corporation of Illinois a Application February 11, 1929, serum. 339,000

13' Claims. (oi. 188-78) This invention relates to brakes, and is illustrated as embodied in an internal expanding brake for an automobile.

One featureof the invention relates to a novel operating device for a brake or the like which includes a simple and effective arrangement of a 'right-and-left threaded nut, or an equivalent part, acting on thrust members engaging the brake friction means. The novelty of the invention resides, not only in the construction and arrangement of its parts, but also in its adaptability to .a brake of the type which shifts its anchorage when the drum reverses its ection of rotation.

Other features relate to. novel adjustable means for connecting the brake shoes, and to other novel and desirable structural details which will be apparent from the following description of the illustrative embodiments shown in the accompanying drawings, in which Figure 1 is a vertical section through the brake,

just inside the head of the brake drum, showing the brake shoes in side elevation;

Figure "2 is a partial section, on the line 2--Z. of Figure 1, showing the operating device;

Figure 3 is a section through the operating device, on the line 3-3 of Figure 1;

Figure 4 is a partial section, on the line 5-4 of Figure 1, showing the adjustment between" the brake shoes;

Figure 5 is a section through the adjustment, on the line"5-5 of Figure 4;

Figure 6 is a section-corresponding to Figure 4, but showing a different adjustment; and

Figures '7, 8, 9 and 10 are respectively sections corresponding to the lower part of Figure 1, but each showing a further and different form of adjustment. j

The brake selected for illustration includes a rotatable drum 20, at the open side of which is arranged a suitable support such as a backing plate 22, and withinwhich is arranged the friction means of the brake. The friction means is shown as including a pair of pivotally and adjustably connected shoes 24 and 26, provided with suitable shoe-positioning means 28, and so arranged that when the drum is turning clockwise the shoe 24 anchors on a fixed post 30 and when the drum is turning counter-clockwise the shoe is anchors on a fixed post 32. p

' The brake is applied by novel means shown as including thrust parts or' plungers 34 pivotally connected to the shoe ends, and which are slidably mounted end to end in spaced alined bearings formed in a bracket 38. The adjacent ends of these parts 34 are formed respectively with right and left threads, or are otherwise formed, for operative engagement with a 1'0.- tatably mounted nut or equivalent member 38,

which in this case is right and left threaded at 5 v its opposite ends so that when turned it forces the shoes apart to apply the brake.

To allow the shifting of the anchorage described'above, bracket 36 may have a stud 40 projecting through an opening in the backing is plate and provided with means such as a nut 42 engaging a retaining washer M slidably engaging the backing plate 22.

Nut 38 may be operated by a novel lever 46, formed in two pieces riveted or otherwise seis cured together with nut 3B permanently mounted between them. Lever 56 may have as its hub two spaced alined portions 48 in which the externallycylindrica1 nut 38 is journaled. Nut 38 is shown adjustably keyed to lever 46-48 by an 29 adjusting screw 50 rotatably mounted in the lever and meshing with a worm thread 52 externally formed on nut 38. Lever it is operated by means such as a tension rod 5% extending through an opening in backing plate 22 at right angles thereto. Lever 45 is operated against the resistance of a compression spring 56 which serves as the return spring of the brake.

The lower ends of the shoes, the weight of which may if desired be carried by a spring 58, w are shown held by a tensioned coil spring 6% against a wedge adjustment shown in detail in Figures 4 and 5. This adjustment includes a transversely-extending wedge made in two parts 62 and 64 seated in transverse guides or ways 35 66 secured to the shoe ends. Part. 82 has a transverse cylindrical socket receiving an externally-cylindrical portion of part til, so that the adjustment also serves as a pivot connecting the shoes.

The adjustment may be operated by means such as a bolt 68, the head of which engages a washer l0 engaging and preferably andt-weltledl to the end of one of, the parts tit-6d, and having a tongue 12 which holds the bolt against turning. A nut 18 threaded on bolt 68 engages a thrust part or spacer it bridging the ends of the shoes and engaging the sides of the shoe webs. Tightening nut it draws wedge tL-M transversely of the shoes toward member it to wedge the shoes apart. 1

In the arrangement shown, member 62 is formed with a wedge-shaped projection 18 seated in a. double-wedge recess in the end of a centering lever 80. Lever an is iulcmmedon a pivot 82 m ranged wedges mounted on the backing plate, and has a spring '4 tensloned between the backing plate and the other end of the lever movement otthe projection 1' in either direction, as the brake is applied, acts on lever 80 to increase the tension of spring, so thatwhen the brake is released the "spring will cause the shoes to be wedged back'to their initial centered position.

In Figure 6, stampings l6 welded to the ends of the shoes form seats for a pair oi oppositely-ar- 18 and Oil which can be drawn toward each other by a bolt 92 and nut 94 to wedge the shoes apart.-

In Figure 7, the end of shoe 24 is curved to seat pivotally in a cylindrical socket in the headed member 86 having a stem on which is adjustably' threaded anut 98 having a' spherical socket pivotally receiving the curved end oi shoe which is threaded a nut lil4 base pivotally arranged in a spherical seat formed having 24. Member 86 and nut 98 have their adjacent faces oi! conical form, to provide a wedge recess receiving the wedge-shaped end of the centering lever ill.

In the arrangement oi Figure -8, shoe It has formed integrally therewith or secured thereto a threaded stem I00 extending into a relatively large socket IOI- in the end of shoe 24, and on having a spherical in the end oi shoe 24.

' In the arrangement shown in Figure 9, a member I06 secured fixedly to the end of shoe 26 is externally threaded to receive an adjusting nut I" in thrust engagement with shoe 24 and is vertically slotted to form a fork embracing the end 01' the web ot-shoe 24. Nut it! maybe formed with a spherical seat pivotaliyreceiving the curved end of shoe 24. In Figure 10, however, the threaded member 0, while slotted to embrace the end'ot shoe I4, is not secured fixedly to-shoe II, but has ahead H2 iormedwith a spherical seat pivotally receiving the rounded end of shoe 2.. The thrust nut I I4 in this case, while adjustably threaded on member Ilii, has a square base engaging shoe 24. Shoe 24 may have pairs or projections Ill embracing member ill to prevent it irom moving heightwiseoi' the shoe. Head III is shown with a conical surface wedgingly received in a wedge-shaped recess in the end 0! the centering lever ll.

Whileseveral illustrative embodiments have been described in detail, it is not my intention to limit the scope of the invention to those particular embodiments, or otherwise than by the term of the appended claims. The above described adjustments are claimed in my divisional applications Nos. 520,800, 520,801, and 520,802, al1

iiled March 'l, 1931.

The present'application is junior to my application No. 286,203, filed June 1-8, 1928, and it is not my intention to claim herein any subject-matter disrclosed and claimed in said prior application.

claim:

1 A brake comp s s. in combination, a drum, friction means having one part which anchors when the drum is turning in one direction and a different part which anchors when the drum is turning in theothe. direction, and an applying device shiitable bodily to allow either oi said parts to anchor and including threaded members connected respectively to the ends of said triction means and a right-and-lett threaded rotatable nut threaded on said members and operable to iorce them in opposite directions to apply the brake.

end oi a' part, and an portion 01 the lever and keying the lever part and which device including threaded members connected respectively to said ends, a right-and-leit threaded rotatablenut threaded on said members and operable to force them in opposite directions to apply the brake, and threaded means for adjusting the brake-released position oi said nut.

3. A brake comprising, in combination, iriction f means having separable ends, and an applying to permit the friction device o! threaded thrust members, arranged end to end,

a right-and-leit threaded nut rotatably and operativel'y threaded onthe adjacent ends of said members, and an operating lever adjustably mounted on said nut and arranged to operate it. 5. An operating device for a brake or the like comprising, in combination, a pair of members arranged end to end, an externally-threaded part rotatably mounted on said members and arranged to act on said members to force them apart, an operating lever having a portion embracing. said adjusting screw mounted in and carried by said portion of the lever and meshing with the externally-threaded part and operable to adjust the lever angularly on said part.

6. An operating device for a brake or the like comprising, in combination, a pair of members arranged end to end, a part rotatably mounted on said members and arranged to act on said members to force them apart, an operating lever having a portion embracing said part, and an adjusting device mounted in and carried by said is operable to adjust the lever angularly on said part.

'1. An operating device for a brake or the like comprising, in combination, a bracket having spaced aiined bearings, thrust members slidabiy supported in said bearings, a nut rotatably supported with respect to said bearings ande'mbracing portions of said thrust members and connected to them respectively by right and left tosaid' threads, and operating means for rotating said I nut.

' 8. An operating device for a brake or the like comprising, in combination, a bracket having spaced lalined bearings, separable thrust members arranged end to end, a part rotatably supported with respect to said bearings, and operati vely connected to said thrust members in such a manner as to iorce them apart when it is turned, and operating means for rotating said part, together with a supporting plate and means' for shiitably mounting said bracket on the supporting plate. a

9. An operating lever having a hub formed with spaced bearings," an operating nut rotat'ably mcunted'in said bearings, andan adjusting screw keying the-nut to the lever and which is operable to turn the nut in said bearings,

10. An operating-lever having a hub formed with, spaced bearings, and an operating nut/rotatably mounted in said bearings. r1

ii. An operating lever having a; hub oi-flied with spaced bearings, operating nutrotatably mounted in m5, the love being formed in two separate halves secured together with the nut permanently mounted between them.

12. A brake having a drum a support at the 2. A brake comprising, in combination, friction means having separable ends, and anapplying open side or the drum, friction means within the drum arrangedto anchor at one end when the drum is turning-in one direction and at the other end .when the drum is turning in the other direction, and a floating operating assembly acting on said ends to apply the brake and shiftable' as a unit to permit anchorage at either of said ends and comprising a pair of members acting on the ends of the friction means and a part between and wedging apart said pair of members and which part has a lever inside the brake and swinging in a plane at right angles to the plane otthe support, and a tension element for operating said lever and attached thereto andpassing outwardly through the support said'lever being 'adjustably secured to said part. c

13. -A brake having a drum, a support at the open side of the drum, friction means within the drum having adjacent separableends, and a float- 5 ing operating assembly acting on said ends to apply the brake and shiftable as a unit to balance its action on said ends and comprising a pair oi members acting on said ends of the friction means and a part between and wedging apart said pair 10 of members and .which part has a lever inside the brake and swinging in a plane at right angles to the plane of the support, a tension element for operating said lever and attached thereto and passing outwardly through the support and means 16 for rotating said part with respect to said lever to efiect an adjustment of the brake.

MONTGOMERY W. MCCONK EYJ CERTIFICATE OF CORRECTION.

Patent No. 2,051,879.

'August25, 1936.

MONTGOMERY W MCCONKEY It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: second column, line 1, before the word "device" in combination, friction means having separable that thesaid Letters Patent should be read with that the same may conform to the record of the ca Signed andfsealed this 24th day of August, A.

(Seal) Page 2 Leslie Frazer Acting Commissioner of Patents.

formed in two separate halves secured together with the nut permanently mounted between them.

12. A brake having a drum a support at the 2. A brake comprising, in combination, friction means having separable ends, and anapplying open side or the drum, friction means within the drum arrangedto anchor at one end when the drum is turning-in one direction and at the other end .when the drum is turning in the other direction, and a floating operating assembly acting on said ends to apply the brake and shiftable' as a unit to permit anchorage at either of said ends and comprising a pair of members acting on the ends of the friction means and a part between and wedging apart said pair of members and which part has a lever inside the brake and swinging in a plane at right angles to the plane otthe support, and a tension element for operating said lever and attached thereto andpassing outwardly through the support said'lever being 'adjustably secured to said part. c

13. -A brake having a drum, a support at the open side of the drum, friction means within the drum having adjacent separableends, and a float- 5 ing operating assembly acting on said ends to apply the brake and shiftable as a unit to balance its action on said ends and comprising a pair oi members acting on said ends of the friction means and a part between and wedging apart said pair 10 of members and .which part has a lever inside the brake and swinging in a plane at right angles to the plane of the support, a tension element for operating said lever and attached thereto and passing outwardly through the support and means 16 for rotating said part with respect to said lever to efiect an adjustment of the brake.

MONTGOMERY W. MCCONK EYJ CERTIFICATE OF CORRECTION.

Patent No. 2,051,879.

'August25, 1936.

MONTGOMERY W MCCONKEY It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: second column, line 1, before the word "device" in combination, friction means having separable that thesaid Letters Patent should be read with that the same may conform to the record of the ca Signed andfsealed this 24th day of August, A.

(Seal) Page 2 Leslie Frazer Acting Commissioner of Patents. 

